Electronic keyboard



FIG. 1 is a perspective view of the front, top and right side of an electronic keyboard showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The portions shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an electronic keyboard, as shown and described. 